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Understanding Thermal Resistance: Key Concepts and Calculations

Thermal resistance is the measure of a material's opposition to heat flow, determined by its thermal conductivity. Materials with high thermal conductivity exhibit low thermal resistance, allowing heat to flow easily. The relationship between pressure drop, volume flow rate, and thermal resistance is crucial in thermal systems. Similar to electrical resistance in series, total thermal resistance in systems can be calculated by summing individual resistances. This fundamental principle is essential for engineers and scientists working in thermal management.

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Understanding Thermal Resistance: Key Concepts and Calculations

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  1. Thermal Resistance

  2. Thermal Resistance • Opposition to the flow of heat. • dependant on the thermal conductivity of a material. • High thermal conductivity yields low thermal resistance

  3. Thermal Resistance Pressure drop (P) Rfluid = Volume flow rate (Qv)

  4. Thermal Resistance -k A T Qv= x -T x Rthermal = = Qv k A

  5. Resistance in Series • Same as electrical resistance in series. • Total resistance is sum of individual resistances • P.221

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